I don't really like sci-fi type shows but this is a little on the edges of it because its not totally out there unreal type things but you can actually think of these things probably happening. And of course it doesn't hurt that the lead characters are fine.
Supernatural is a superb show!!! Not only does it scare you every week but it also shows the struggles of the Winchester family with each other and their inner demons. The bond between Sam and Dean is another big attraction to the show for me. To see the both of them and what they are willing to sacrifice for each other is just something we don't get to see in other shows.
I already knew Jensen Ackles and Jared Padalecki from their previous shows so it was already a plus to know that they're on the show. Their acting in this show is great. It's surprising that they aren't brothers they are great together as on-screen brothers.
Another good thing about this show is they feature songs from basically before I was born and I fell in love with some of them. I wouldn't have ever heard them if it wasn't because of Supernatural and Eric Kripke. Even the bloopers from season 1 are great!